Nasa rover discovery hints at ancient microbial life on Mars

A 3ft by 2ft rock marked with off-white spots may offer fossilised record of microbes dating back billions of years

A spotty, vein-filled rock found by a Nasa rover on Mars contains features that suggest it may have hosted microbial life billions of years ago.

The arrowhead-shaped rock, named Cheyava Falls, was discovered by Nasa's Perseverance rover on 21 July as it trundled along the northern edge of Neretva Vallis, an ancient river valley carved by water flowing into the red planet's Jezero crater.